Power-transmitting device.



F. R. MOBER'IY.

POWER TBANSMITTING DEVICE. APPLI'OATION FILED 113.27, 190s.

922,802- Patented May 25, 1909. u y 2 sums-SHEET 1 Inventor:

P. R, MOBERTY. a POWER TRANSMITTI'NG DEVICE.

APPLIUATION FILED 11:13.27, lana. l

Patented May 25, 1909.

asume-snm z.

IIIIHIINIK//I NITED STATES. `ierirnivr oirrion .lllnANx n. MCBERTY, or NEW ROCHELLE, NEW YORK, AssIGNoR To WESTERN Y To all whom it Amand/concern.:

ioV

ELEvTRIo v COMPANY, OF CHIGAGQiILLlNlOIS, A CORPORATION OF ILLINOIS.

f eoWER TraaNsuru'mrnvel naviera .i Specificationof Letters Patent.

Application med February 27, isps. serial 110,418,124.

Be it known that I, FRANK R. MoBErrrr, a citizen of the United States, residing in the town of New Rochelle in the county of Westchester and State of ew York, have .invented Va certain new and useful Improvement in Power-Transmitting Devices., 1 of which the following is a full, clear, concise, and exact description.

mitting power fromv a drivin .part to a driven part through the medium o clutch mechanism under the control of an electro-magnet.

More articularly, my invention has for its object the provision of electro-magnetically actuated clutch mechanism under the control of which the driving part may cause the driven part to start, sto and move in one direction or another, an at a speedhaving any desired relation to the speed` of movement of the driven part,-this complex control of the driving over the driven part being exercised with the maximum simplicity of apparatus and with the greatest degree of relia ility in theoperation of the mechanism.

Furthermore, it is the object of my invention to providea device in which the direcftion in which the driven part is moved is automatically determined by the relation which exists between the portion of the clutch ,mechanism associated with thedriven ypart and the portion of the mechanism associated with the driving part, an actuation of the clutch mechanism when the driven part is in its normal position causing the movement of that part in one direction, while the energize.- tion of the clutch device when the driven part is out of its'normal position results in that part being moved in the other direction back toits osition of rest. By means of this novel feature it becomes possible to cause the starting, the stopping, and thel movement ofrthe driven part in one direction or the other by merely opening and closing la simple circuit in which the energizing Winde ing tof the clutch magnet is included.. ThisA result I preferably secure by arranging the clutch "member associated with the driven part so that inthe normal position of. the

driven part the memberis `attracted at one 'point into engagement with the clutch mem-- er associated with the driving pant, while Vwhen the driven part isV out of its normal osition the clutch member associated with that part is attracted at another point into driving My inventioii relates to a device fortrans` ciated with the driving part.

My invention also contemplates a relation between the .clutch members which permits the driven art to be moved at different rates of speed wlth a constant rate of speed of the.

art; and' also the provision of a connection between the driven part and its associated clutch member that enables that member to be freely moved into engagement with its 4coperating clutch member, while at the same time it'is rigidly secured to the driven part with respect to the movement of rotation of that part;

The above and other features of my invention Will be more specifically set forth in thel des iption which follows, and `will be point` ed out in the appended claims. y

l shall now particularly describe my invention by reference to the accompanying drawings, in which- Figure 1 represents one embodiment of my invention ap li'ed to the particulark Work of .controlling t e movement of an electrical switch; Fig. 2, a plan View of the device on line 2 2 of Fig. 1; Fig. 3, a cross section of the clutch disk on line 3-3 ofFig. 2; and Fig. 4, a detail View partially in section' of thearrangement of the clutch magnet upon the drivin shaft. As i lustrated in the drawings, the present embodiment of my invention is mounted in a frame the u per portion of which may serve to support t e device which is to be operated through the medium of the power-transmitting l mechanism. ln the present instance this device is shown to 'be a switch designed to serve for completing connection 4between a movable contact partor terminal 2 ,and any one of a number o or terminals 1. The stationary terminals 1 are mounted in a row in the arc of a circle, and consist of metal punchings su ported vin a block of insulating material and aving one of the ends of each projecting through the inner face of the block into position to be enaged by the movable contact or terminal 2. 'he movable terminal 2 consists, in the res--l ent instance., of a-metal punching in the orm of a bell-crank lever, one of the'arms of the lever having a rounded face adapted in the movement of the. movable terminal vto be brought into engagement with the stationary termlnals 1,l one a ter another, and the other. arm being engaged by a leaf spring 45, which* stationary contact parts serves to press the contact face of the lever against the stationary terminals over which it passes, The movable contact lever is fulcrumed upon a rod 42, from which it is insu'-r lated by an insulating bushing 43. TheI fulcrum rod 42. is supported upon .a frame 53 that is secured by means of a collar tio the f indicated.

' efficiently employedv with a diversity of mechanism, and that its use is' not restricted to de- A vices of the cl'iaracter of that particularly illustrated and described.

The movement of the electric switch or other mechanism operated by the powertransmitting device of my invention, 4is effected in the embodiment here illustrated, by means of power derived from a constantly rotating shaft and controlledin its ap lication to the switehycarriage, or other ffiven part, by means of the electro-magnetic clutch mechanism. The power ordriving shaft 70, as shown, is journaled in split bearings 71, mounted on the frame that supports the electric switch or other driven device, the

bearings being'supported\upon the two uprights 31. The shaft 7() is of steel.; but between the bearings 71 it is surrounded by a' sleeve 81 (Fig. 4) of Norway iron, which shields the shaft from the magnetic effect of the magnetizing winding that surrounds the Y sleeve and shaft, and neutralizes by its shortcircuiting action any permanent magnetism due to the magnetic retentivity of thesteel of the'shaft. If. desired .the shaft may be made of non-magnetic material, witlfonly such parts of" it of magnetic material as are involved in the operation of the clutch mech-- 'anism. Y

. The shaft .70 carries two circular heads 13 and 14 of Norway iron, these v.heads being convenientlyv secured to the shaft by Ameans of set screws (not shown), and constituting the pole pieces of the magnet which forms one element of the magnetic clutch. The

head 14 is preferably of somewhatA greater 'diameter than -the head 13,- for a purpose which will hereinafter be explained. tween the heads' 13 'and 14 is a magnetizing l. helix or winding 11 through which the shaft '.with its soft iron'sleeve passes loosely, the winding being placed upon a spoolwith metallicheads-72 aving projecting portions 82 he cir- 78,- in the norma (Fig. 1) by meansof which the spool is supi' ported upon a transverse rod 73 the ends of which are secured in the lugs 30 at the base of the frame. the power shaft to cause its rotation through the medium of a pulley wheel 74 se,-

Power is communicated to cured to one end of the shaft, or in any other convenient manner.

'As the shaft. rotates the soft iron sleeve and the attached ends 13 1 and 14 turn with it, while the Spool containing the magnetizing winding 11, through whichthe shaft passes, remains stationary. y

Firmly secured to the lower end' of the shaft 55 ofthe driven device is a disk orpllatel 12, which servesl as the armature for the elec- Vtro-11 1a, fn'et made up of the 4msfghetizing winding 11, power shaft 7() and the heads 13 and 14, and which constitutes the other element or member ofthe magnetic clutch that controls the' application of vpower to the' lnovementof the driven device. i turedisk or plate 12 of the clutch magnet consists of an annulus 75 of soft iron having as its support. or supporting connection a thin plate or diaphragm 76" convenientlyv made of steel, bronze or like elastic material, riveted over the centralaperture, and having Two dents 78 and 79 are formed in the clutch magnet disk, at points that are substantially diametrically op osite each other, the dent at itslcenter a collar 77 m which thee-nd of 4the shaft of the driven device is fastened. y .95

os'ition of the switch car- -riage or. other driven mechanism lying directly over the head 13 ofthe clutch magnet, and the dent 79 lyin directly lover the lxead 14. The d ent 78 is depression in the upper side of the disk anda protrusion on the 'under side 'of the disk, ,105

while the dent 79 is formed to cause a depresormed so :1s-to cause 'a sion on the under side ofthe disk and :a protrusion on the upper side.

As illustrated 4' the drawings,.the,eluteh magnet occupies a position somewhat offsetwiti respect to the driven disk or plate 121of the switch carl-ia e; that is, it is so mounted with respect to t e disk that the head 13 of the magnet is presented to the disk at a consideraby greater distance from the center of support of the disk upon its shaft than; the point at which `the head 14 ofthe magnet is resented.. I have already stated that the head14 of the clutch magnet is of somewhat greater diameter than the head 13. As a .result, the disk 12 being ada ted to rotate in a power shaft'70, the head 14 normally lies closer to the plane of the surface of the disk 12 than does the head 13. Therefore, when the clutch magnet is energized agreater at- V "5.

tractive force would ordinarilvzbe develo ed plane substantially paralle to the axis of the between the' head14and the disk than ietween the head 13 and the disk. But, as has been described, when the switch carriage or driven device is in its normal position the nasca disk 12 las with uw dem 7s directly' over the head 13,- and with the dent 79 directly overthe head 14. Consequently, in the normal position of the switch carriage, the downward protuherenee caused bythe dent78 brings the disk into vclose relationwiththe head 13, while vthe de ression on the underl side ofthe disk caused )y the dent 79 causes the disk to lie considerably farther than its normal distance away from the head 14.

When the clutch magnet is energized, therelonge-r modify the normal relation wherein the surface of the disk lies closer to the head 14 than to the head 13, and as a result when the clutch magnet is energized, the disk is attracted into engagement with the larger head 1.4 and is tilted away from the smaller head 13'. ln both eases when the clutch magnet is` dencrgizedthe elasticity-of the diaphragm 76 at the center'of the'diskimmediately draws thel disk out of engagement with the head and restores it to its normal position. I

vIt is desirable that the' element of the clutch 'magnet through which the power of rotation is applied to the driven device shall be free to move into and out of engagement with the rotating part, under the influence of the electroemagnetic action, but at the same time shall be rigidly connected to the shaft of the driven'de'vice with respect to the' rotational movement thereof. This purpose is served admirably by the construction which l have illust-rated and described, which involves the elastic diaphragm as the connect ing medium between the shaft of the switch carriage and the armature' of the magnetic` clutch. This elastic connection leaves the disk free for fiat-wisel movement into engagement with theclutch magnet, but holds it in connection with theshaft of the switch carriage with respect to the edgewise move- 'ment of rotation.

I h ave heretofore mentioned thefact that the dlsk 12' and the clutch magnet are preferably so related that the head 13 is adapted to engage the disk at a greater distance from the ,center of the Ydisk than. the head 14..

` with the head V14 than when it is in engagement) with the head 13; and the other is to keep separate the paths of engagement of the heads with the disk, so that either path may Y uire Without affecting the other path. Thus t e path of engagement of the head 13 with the' disk requires that at a certain point a dent 7 8v of a certain form shall be provided, While the ath ofengagement ofthe head 14 with the isk' requires that at a certain point a dent 79 ,of another form shall be provided. By causing the heads to engage at different.

distances from the center of the disk neither dent 'istbrought into the path of movement on the disk of the head With which .it is not associated. v

l The advantage of having the driven .device move,v faster at onetime than at another in the particular use towhichl have shown "be .given whatever characteristics it may re the device. ofmyfinventi'on applied, is that/e.. the return of the movabley terminal of the4 switch to its normal or resting position may be e-iTected at a higher' rate of speed than the 55 advance of that terminal to connect with a particular one ofthestationary terminals, the speed of advancebeing necessarily slower to permit accurate selection of the desired stationary terminal. It willbe understood that although, in the present instance, the arrangement of the arts .is such that the return movement of t e driven device is eXecuted at a higher rate of speed than the ad-` vance movement, this relation may be reversed hy merely changing therelation of the Vengaging portions of\the clutch members to each other, or the speed in both directions may be made the same'. Likewise, by a" mere change in 'the rfelation of the engaging' portions of the clutch vmembers Ithe driven device may be selectively operated to move at different rates of speed in the same direction.

The driven disk 12 is provided with a rivet 80 having a head which projects onfthe un-A der side of the disk in close proximityT to the deep end of the dent 79,l and which forms a stop for preventing the disk being driven be'- yond this point by the head 14 in the return movement of the switch carriage. As has been stated before, when the switch carriage is in its lnormal position the dent 78 lies directly over the-head .13 of the clutch magnet, and within the actuating range of its magnetic attraction while the'dent 79 lies directly over the head 14, so that the energiza-- tion of the magnet causes the disk tobe. 4drawn into engagement with the head 13 and to be tilted away fromthe head 14. yThe rotation of the power vshaft M70 is such as to cause the switchcarriage to be rotated in a clockwise direction when the disk12 is in engagement with the head 13, so that after Vthe magnet has'been energized the head 1.3

remains in' engagement with the-disk and the carriage continues to be rotated from left to right until the magnet is denergized. UponJ a subsequent energization of the magnet, the surface of the disk now being 'closer to the .head 14 than to 'the head 13', and within the actuating range `of the magnetic attraction of head 1 4 that head attracts theC disk into `engagement lwith it 'and tiltsy the disk away from the head13; and,'engaging the disk as it does ontheother side of its center, causes the switch carriage to move in a reverse direcA tion, from right to left, until the disk has been rotated far enough to bring the dent 78 over the head 13 and the dent 79 over the' head 14. In this position the attractive l' force between the head`14,-which is driving -the vdisk in its return movement,-and the disk is decreased, while the attractive force between the other head 13 and the disk is augmented; and at the same time the head` of the rivet S() isbrought into position where, if-the engagement between the head 14 and the disk persists, it isinterposed yas a positive stop to any further return movement.

In order that the magnetic attraction between the clutch magnet and the disk may cease promptly upon the cessation of current flow in the magnetizing winding 11, I

.prefer to employ -a construction \for vthe clutch and its armature disk or plate such as that which I have shown anddescribed,

wherein the magnetic circuit is not completely closed during the energizationof the magnet, but has asmall air gap (the space between disk 12 and one ofthe heads- 13, 14)

either at one'pole or the other which insures" prompt de-inagnetization when the current ceases'. to circulate in the winding.

- 'disengaging the disk from the clutch magl between the driving and driven elements.v 40- the point'of maximum magnetic flux con-v net, becauseof the rolling magnetic contact stantly and the iiuX is reduced or destroyed promptly by ine ualities in the -magnetic contact, and by, ysteresis and eddy currents occurring in the iron itself. Ihe ef,- fects fof the retentivity or residual magnetism in the iron are thus reduced to a minimum, and prom t separation ofthe parts' after reduction ofthe current in thesolenoid is brought about. importance in in ot'ors for driving switch mechanisms in automatic exchanges.

As a means of eil'ecting the energization and deenergization of the clutchmagnet to ca use the starting, stoppingand return to its normal position of e switch or .other driven device I have illustrated a -simple circuit including the Winding of the clutch magnet with a source of current 6, thecon- The `peculiar construction of the clutch is adapted to the same end,namely, promptly This result is `of great' tinuity of the circuit being controlled4 by/ a switch'key 7. If the switch or driven part is in its normal or resting position, and the switch key 7 is depressed toclose the energizing-circuit, the clutch disk 12 is drawn into engagement with the magnet head 13l 1and is tilted -away from the magnet head 14,

on account of the surface of the clutch disk 12 at thattime, lying closer to the magnet head 1,3 than to the'head 14. attracted into engagement with the head 13, the surface of the disk remains in engagement withthis head and out. of engagement with .the other head so long as the key 7 is held depressed and current continues to flow through the winding of the clutch magnet. When,`in the present instance, the movable terminal of the switch has been rotated. far enough to cause it to complete connection with the desired one ofthe stationary terminals, the key 7 is'released and, the clutch magnet being. promptly denergized, the

clutch disk 12, impelled by the tension im-v parted te, it by' the elastic diaphragm 76,

springs away from the Ymagnet head 13 with which it has been in engagement.y In the off-normal position to which the clutch diskJ 12 has thuslbeen advanced, the relation between the plane surface of the disk and the magnet head is no longer modified bythe dents 78 and `79 which lie above the heads in thenormal position of the disk, and the head 14, being of greater diameter, lies' closer to the surface of theclutch disk than the head 13,- as has heretofore been eX.-

Havingbeen plained. Consequently, when the energia ing circuit is again completed by depressing thekey 7, the clutch" disk Vis attracted into engagement with the head 14 and' is tilted away from the head 13, and the return movement of the driven device begins. The

disk remains -in engagement with thehead 14 and the return movement continues as long as the energizing circuit remains closed, or until the lclutch disk has ,been rotated back to its normal positionF as shown'in the drawings. When this position has v been reached further return movement is prevented by the engagement between the magnet head 14 and the head of the rivet 80 and, the switch key 7A being released, the v clutch disk comes torrest with its surface again in position to cause the disk to be attracted into engagement with the head 13 and to be tilted away from the head'14 when the clutch magnet is againenergized.

I have illustrated a simple manually oper? ated key for controlling the energizing circuit o'f the clutch device, but it will be understood that the energizing circuit may be controlled by automatic switch mechanism, relays, or in any other desired manner, depending upon the character of the use .to which the device is put. It will also be understood that the relation between the engaging parts lo l the b `invention; as, for instance, by causing the clutch member associated with the driven .part to be selectivelyv attracted to one or another of two oppositely moving points on the periphery of a single magnet head, instead of into engagement with two magnet heads at points onopposite sides "of the center of support of the-clutchmember upon the driven shaft.

I claim:

1. Av power-transmitting device, comprising a driving shaft and a driven shaft, and an electro-magnetic clutch having one member secured to one of said shafts and another 'member secured to the other of said shafts, one of said clutch members being arranged with its surface in proximity to the other of said clutchv members at two points, and being adapted when attracted at one point to cause the movement of the driven shaft in one direction, and when attracted atl the other point to cause the movement of thedriven shaft in the otherdirection.

'i 2. A power-transmitting device, comprising a driving partfand a driven part, and an electro-magnetic clutch having onel member secured to one of said parts and another member secured'to the other part, the members of said clutch being adapted to be attracted intov engagement with each other at one or the other of two points to. cause the movement of the driven part in one direction or the other. l 3.- A power-transmitting device, comprising a driving shaft and a driven shaft, and an connected tothe driven shaft and another member connected to the driving shaft, said clutch members being ladapted to be attracted into engagement with each other at either of two points, and means for causing the engagement to .take place at one -of the oints when the driven shaft isin its norma position, and at the other point when said driven shaft is out of its normal position.

4. A power-transmitting device, compris- V'inga driving shaft anda driven shaft, and an electro-magnetic clutch'having one member connected to said driven shaft and nother ymember connected uto said driving shaft, the members o f said, clutch being adapted to be selectively attracted intoengagement with each other at either of two points to .cause said driven shaft to rotate at different rates with respect to the rate of rotation of said driving shaft.

5. A powertransmitting device,`compris ing a driving shaft and a driven shaft, a clutchv disk connected to one of said shafts, and a clutch magnet having magnet heads secured to the other of said shafts, said heads electro-magnetic clutch. having one member being presented to said clutch disk at opposite sides of its point of support upon its shaft, said clutch disk being adapted when attracted into engagement with one of said heads to be tilted away from the other of said heads, whereby an air gap is maintained in the magnetic circuit during the energization of the clutch magnet to insure prompt demagnetization when current ceases to flow.

6. A power-transmitting device, compris- 'inga driving shaft and a'driven shaft, and an electro-'magnetic clutch including two members,'one ada ted to drive the other by rollinto engagement with each other ateither of two oints to cause the rotation of the driven s aft in one direction or the other, the attraction of said members into engagement with eachJ other at one point causing their separation at the other point.

8. A power-transmitting device, com rising a driving shaft and a driven sha t, a

clutch magnet associated with one of said shafts anda clutch disk associated with the other of. said shafts, said clutch disk being adapted Ato` be attracted to said magnet at one side of the point of support of said disk when said driven shaft is in its normal position, and being adapted -to-be attractedto said magnet at the other side of said point of support when said driven shaft is out of its normal position.

9. A power-transmitting device, comprising a driving shaft and a driven shaft, a clutch'magnet arranged upon one of said shafts, two magnet heads for said magnet secured to said shaft, andfa clutch member secured to the other shaft, said clutch member being adapted to be attracted to one or the other of the heads of said magnet.

10. A power-transmitting device, comprising a driving shaft andl a driven shaft, a magnet associated with one of said shafts,

two ma net heads for said magnet secured to said s 'iaft,` and aclutch member associated with-the other shaft,said clutch member lying closer to one of said heads than to the other when said driven shaft is in its normal position, and lying closer to the otherof said eads when the driven 'shaft isl out of its normal position.

i a clutch magnet associated with the other yof said shafts, said magnet having two heads secured to`the shaft and resented to said' clutch disk on op osite si es of the point of sup ort of said isk upon its shaft, Vone of sai heads being presented'to said disk at.a point closer to the point of support of said disk than the other. head, whereby the driven 4 shaft may be causedto advance and recede atl varying speeds with a constant speed of rotation of said driving shaft.

12. A power -transmitting device, comprising a driving shaft and adriven shaft, a clutch member secured to one of said shafts, a clutch magnet associated with the other of said shafts, two magnet heads for said'magnet secured to said shaft', said heads being presented to said clutch member at different' distances from. itspoint of support upon its shaftg and means for causin said clutch member to be brought .selectively into en 0'agement Awith said heads, whereby said ldriven -shaft may be moved at d-ierent. speeds with a constant speed of vrotation of saidV driving shaft.

1 3. A power-transmitting device, comprisl ing a driving shaft and a driven sha clutch disk secured to onevof said shafts and adapted to rotate therewith, a clutch magnet associated with the other shaft and havin i magnet heads secured lto said shaft, sai

heads being presented to said clutch disk at different distances 'from'its point of support .upon its shaft, and means for causing the of'said driving shaft. 40

clutch magnet arranged upon the other of said shafts and having two circular magnet heads or olessecured to the shaft, said mag-r net' hea s orpoles being resented to said clutch diskat opposite si es of its point of support upon its shaft and at different distances from said point of support, and means foreifeeting the selective attraction of'said' clutch disk into engagement with one or the other of said heads, whereby the driven shaftJ maybe rotated in one direction or the other at different speeds with respect to. the

' speed of rotation ofsaid driving shaft.

1 5. A power-transmitting device, compris- K 'ing a driving shaft, anda driven `shaft arranged/substantiallyatright angles thereto,

a clutch disk-secured to one 'of saidshafts, a clutchmagnet Vassociated with the other of said shafts and having two magnet heads secured tothe shaft, said magnet heads being o'f dif rent diameters and being presented to said c u tch disk on opposite sides of its point upon its s reaches its normal position,

ive attraction of said disk into enga ement of. support, and means for effecting the select.-

with one or the other of said heads, w ereby i the driven shaft ma be moved in one direction or the otheran at different speeds with respect to rate of rotation .of s aid `driving .l

shaft.

disposed substantially at right angles there- 16. A' poWer-transmittin device, conm-v Aprising a driving shaft, an

a driveir shaft to, a clutch. disk secured toone of said shafts,

a clutch magnet associated with the other of said shafts and having two magnet'heads se'- Y cured yto the shaft, said magnet heads being of different diameters and being Ipresented to said clutch disk at' op osite Asides of its pointl of sup ort upon its s aft, and a projectionv upon t e ortion of the surface of said clutch disk to w ich the magnet head of the smaller I diameter is presented when said driving shaft is in its normal position, said head of smaller diameter lying closerto the surface of saidl disk'than said head of larger'diameter when said driven shaft is in its normal position, and being .more remote from the surface of the ldisk when its driven shaft is out of ,its normal position. I 5 v 17, jA power-transmitting device, comprising a driving shaft and a driven shaft, a clutch disk securedl to one of said shafts, a

clutch magnet associated with the other .of

cured to said other shaft, said magnet heads being presented to the surface of said clutch disk on op osite sidesf` of its point of support liaft, said clutch disk being provided with a projection and with a depres- 'sion of the surface to 'which said magnetv heads are presented,l said projection lying over one of said ma net heads and said dethe normal position of the driven shaft.

' said shafts and having two magnet heads selos pression lying over t e other oflsaid heads in e 18. A ower-transmitting device, compris-V ing a driving shaft, and a driven shaft disposed substantially at iight angles Ithereto,

a clutch disksecured to one of said shafts, a clutch magnet assooiatedwith the Aother of said shafts, said clutch magnet having-two magnetheads presented to the surface of said clutch' 'i'sk at op osite sides of its pointof support upon itss aft,said clutch disk hav- .ing a projection and a depressionof that sur- 'face to which said magnet heads are presented, theprojection llying over one of the heads and the depression lying over of the heads in the normal osition of the driven shaft, and a non-magne ic stud carried by said disk and adapted to .stop the return movementl of said driven shaft when itl 19. A ower-transmitting ing a driving shaft and a driven'shaft, a clutchn'iagnet associated withone of said shafts and having a magnet head secured .to J -said shaft', .and a clutch disk with one of its 130 the otherV device, comprisflat surfaces lying in proximity to but normally out of engagement with said magnet head. said clutch disk being secured to the other shaft loosely with respect to flatwise movement but rigidly with respect to edgewise movement. h s

20. Apower-transmitting device, comprising a driving shaft and a driven shaft, a clutch magnet having a magnet head associated with one of said shafts, a clutch disk having one of it s [lat surfaces in proximity to but normall \Y out of engagement with said magnet head, and an elastic ('liaphragm at the center ol' said disk, said disk being se- I cured to said other shaft `through the medium of said elastic diaphragm, whereby said diskvmay incline its plane to be drawn into engagement with said magnet head when the magnet is energized but is prevented from lrotating with relation to its shaft.

21. A power-transmitting device, comprising a driving shaft and a driven shaft, a i exible disk secured to said driven shaft, an electro-magnet arranged upon said driving shaft with its axis substantially coinciding with the axis of the shaft, and circular heads'for said magnet, said disk being adapted .to be selectively attracted into engagement with one or another of said heads When said electro-magnet is energized. l

22. power-t'ransmitting device, com rising a driving shaft and a driven sha t, a

' clutch disk secured to one of said shafts rigidly with respect to rotational movementbut.

loosely with respect to fiatwise movement,

an electro-magnet having magnet heads se cured to the other of said shafts and resented to the surface of said clutch dis at two points, and meanmii1 causing the flat- Wise movement of said elu cli disk selectively into enga ement with said magnet heads at either of t e two points.

spect to edgewise movement but flexibly.

with respect toviiatwise movement', and another coperating clutch member secured to said other art, said first mentioned clutch member being adapted to be moved fiatwise into engagement wlth said coperating member selectively at either of two points to effect the mov ment of 'said driven part in one ling; a driving shaft,I

direction or another. v 24. A'power-transm'ltting device,compris l' a d a 'driven shaft ai'-,

ranged substantially at right angles thereto,

l .a clutch disk .secured to said driven shaft etl rigidly with respect. to rotational movement but flexibly with respect to iiat'wise movement, an electro-magnet havmg lts magnetizing helix wound j about said driving shaft,

and heads for said electro-magnet secured to and rotating with s'aidLdriving shaft, said heads being presented toene of thel [lat surfaces of said clutch disk at opposite sides of its point of support upon its shaft, said disk and heads heilig' arranged to cause the surface of the disk to lie closer to one of the heads in an off-normal position, whereby the disk is attracted flatwise -into engagement with one of said heads todrive thc shaft in one direction'when thc driven shaft is in its normal positlon, and mto engagen'ient with the other-head to drive the ,shaftlin the reverse direction when said shaft is out of its normal position. y

25. A power-transmitting device, comprising a driving shaft and a'driven shaft, one of said shafts being of'material having high magnetic retentivity, a clutch magnet having a magnetizing helix surrounding said shaft, a sleeve. of material having low magnetic retentivity interposed between said helix and said shaft to neutralize and prevent the permanent magnetization thereof, pole pieces for said clutch magnet, anda co erat'ing clutch member associated with sald driven shaft and adapted-to be drawn into engagement with one of said pole pieces when the clutch is energized.

26. In a power-transmitting device, the combination of a friction wheel, an electromagnet, an armature for themagnet in the form ofa friction wheel adapted when attracted by the magnet to be broughtinto rolling contact with the first-named friction wheel, and a yielding support forl the arma# V ture acting to` hold it out ofcontact with the first-named friction wheel when not attracted by the magnet.

27. In a power-transmittingdevice, the combination of twof rotary friction disks of magnetic material, one of which is yieldingly` supported. and adapted to be moved into rolling contact with the other by magnetic attraction, the rotation of said yieldingly supported disk operating to change its relation to the other friction disk from a'position -within thev actuating range of magnetic attraction to a position beyond said actuating range of attraction. y

28; In a power-transmitting device, the combination of a pair of friction wheels adapted for. rolling contact with each other, one of said wheels being supported yeldingly to move tothe other, and a magnetizing helix adapted to produce a flux through the rolling contact, said friction disks being formed lto 'be vnearer together in one position of rotation than in another; whereby when nearest together theymay be lbrought into a frictional contact by the magnetizing helix, so held during continuous magnetization'thereof,l

and when released by said helix'willA assume;

said position of Wider separation. v

29. In a, power-transmitting device, thev combination of'three friction disks, amagnetizing helix adapted to magneti'ze either of j130 I oi szrid 4disks to 'attract the third into l vto remain 1n Contact during'continued 11mg- *'sitions alternately, nndvyielding supporting menus adapt-ed to permit. either pair 0f disks netizu'tion thereof.

v30.- ln a;'powervtranshiitting device, the l combination of a yieldingly supported driven friction disk,l two driving disks at points on g opposite sides of the axis thereof, and a magi netiz'ing helixacting upon said driven disk to -bring'it into Contact with one or the other of said driving disks, said driven disk being carried by each driving disk into -position to be brought into Contact with the other driv'- ing disk upon :1. succeeding energiztion of the helix. Y y

l FRANK 1i. MCBERTY.

Witnesses: A y

NICHOLAS E. Ken-NAN, WILLIAM G. MCKNIGHT. 

